^[\p{L}\p{N}]{1,50}$ >>> plus one rule

Question

Hi,

I've this regex: ^[\p{L}\p{N}]{1,50}$

• Accept all numbers and all letters
• min length: 1
• max length: 50

I'm trying to add this rule without success:

• can add \s (spaces) but the text can not have only empty spaces

Answer 1

If your regular expression implementation supports look-ahead assertions:

^(?!\s+$)[\p{L}\p{N}\s]{1,50}$

Answer 2

allow it and then trim double+ spaces

Answer 3

Assuming it can't start with a space:

^[\p{L}\p{N}]{1}[\s\p{L}\p{N}]{0,49}$